<template>
  <view>
    <!-- 商品列表渲染 -->
    <view v-if="cart.length" class="goods-list">
      <view class="cart-item" v-for="item in cart" :key="item.goods_id">
        <!-- radio 小程序组件库自带的 -->
        <radio @click="changeCheck(item)" :checked="item.goods_checked" color="#EB4450" />
        <view class="cart-count">
          <u-number-box
           @change="changeNumber"
            :value="item.goods_number"
            :name="item.goods_id"
            @overlimit="delGoods($event,item.goods_id)"  />
        </view>
        <!-- hover-class="none" 取消链接组件按下时的灰色样式 -->
        <navigator
          class="goods-item"
          hover-class="none"
          :url="`/goodsPkg/goods_detail/goods_detail?goods_id=${item.goods_id}`"
        >
          <!-- 商品图片 -->
          <image
            class="goods-image"
            :src="item.goods_small_logo"
            mode="aspectFit"
          />
          <!-- 商品信息 -->
          <view class="goods-info">
            <view class="goods-name">{{ item.goods_name }}</view>
            <view class="goods-price">{{ item.goods_price }}</view>
          </view>
        </navigator>
      </view>
    </view>
    <u-empty
    v-else
    marginTop="50"
        mode="car"
        icon="http://cdn.uviewui.com/uview/empty/car.png"
     >
     <navigator
      url="/pages/index/index"
      open-type="switchTab"
     >
      <u-button size="small" text="去逛逛吧" color="linear-gradient(to right, rgb(66, 83, 216), rgb(213, 51, 186))"></u-button>
     </navigator>
     
</u-empty>
    <!-- 底部操作栏占位 -->
    <view class="bottom-bar">
      <!-- 固定定位的操作栏  -->
      <view class="bottom-bar-fixed">
        <view class="select">
          <radio class="select-radio" @click="isAll=!isAll" :checked="isAll" color="#EB4450">
            全选
          </radio>
          <text class="select-radio"></text>
        </view>
        <!-- 合计 -->
        <view class="total">
          <text class="total-name">合计：</text>
          <text class="total-price">{{ checkPrice }}</text>
        </view>
        <!-- 结算 -->
        <view class="account" @click="goToPay">去结算({{ checkTotal }})</view>
      </view>
    </view>
  </view>
</template>

<script>
import {mapGetters} from 'vuex'
export default {
  name:'Cart',
  data(){
    return{

    }
  },
  computed:{
   ...mapGetters(['checkTotal']),
   ...mapGetters(['checkPrice']),
   ...mapGetters(['checkList']),
  cart(){
    return JSON.parse(JSON.stringify(this.$store.state.CartList))
  },
  isAll:{
    get() {
    return this.cart.every(item=>item.goods_checked)
    },
    set(val){
      this.cart.forEach(item=>item.goods_checked = val)
      this.$store.commit('updateCartList',this.cart)
    }
  }
  },
  methods:{
    // 单选状态
    changeCheck(item){
      item.goods_checked=!item.goods_checked
      // 深拷贝后需要修改vuex数据
      this.$store.commit('updateCartList',this.cart)
    },
    // 修改数量
    changeNumber({value,name}){
      const result = this.cart.find(item=>item.goods_id === name)
      result.goods_number = value
      this.$store.commit('updateCartList',this.cart)
    },
    // 删除
    async delGoods(type,id){
      if(type==='minus'){
        const {cancel} = await uni.showModal({
          title: '提示',
          content: '确定删除吗？'
        })
        if(cancel)return
        const index = this.cart.findIndex(item=>item.goods_id===id)
        this.cart.splice(index,1)
        this.$store.commit('updateCartList',this.cart)
      }
    },
    // 去结算
    goToPay(){
      if(!this.checkList.length)return uni.showToast({
        title: '请选择商品',
        icon: 'none'
      })
      uni.navigateTo({ url: '/pages/pay/index' })
    }
  }
}
</script>

<style lang="scss">
// 商品列表
.goods-list {
  .goods-item {
    display: flex;
    padding: 25rpx;
    .goods-image {
      width: 190rpx;
      height: 190rpx;
    }
    .goods-info {
      flex: 1;
      font-size: 24rpx;
      // 垂直方向两端对齐
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      padding: 20rpx;
      .goods-name {
        // 多行超出隐藏
        overflow: hidden;
        -webkit-line-clamp: 2;
        text-overflow: ellipsis;
        display: -webkit-box;
        -webkit-box-orient: vertical;
      }
      .goods-price {
        color: #eb4450;
        // 前面的价格符号
        &::before {
          content: '￥';
          font-size: 80%;
          margin-right: 5rpx;
        }
      }
    }
  }
}
// 购物车列表项
.cart-item {
  display: flex;
  align-items: center;
  padding-left: 20rpx;
  border-bottom: 1rpx solid #ddd;
  position: relative;
  // 清除最后一项的底边
  &:last-child {
    border-bottom: none;
  }
  // 步进器外层盒子，定位实现
  .cart-count {
    position: absolute;
    // 体验优化细节：扩大盒子范围，防止用户误操作
    // background-color: pink;
    padding: 20rpx;
    bottom: 0;
    right: 0;
  }
}

// 底部操作栏
.bottom-bar {
  // 占位用
  height: 100rpx;
  // 定位的操作栏
  .bottom-bar-fixed {
    height: 80rpx;
    position: fixed;
    z-index: 99;
    left: 0;
    right: 0;
    bottom: 0;

    border-top: 1px solid #eee;
    background-color: #fff;
    display: flex;
    align-items: center;
    padding: 0 20rpx;

    .select {
      .select-radio {
        font-size: 24rpx;
        color: #999;
      }
    }

    .total {
      flex: 1;
      display: flex;
      align-items: center;
      margin-left: 40rpx;
      .total-name {
        font-size: 24rpx;
      }

      .total-price {
        color: #eb4450;
      }
    }

    .account {
      background-color: #eb4450;
      color: #fff;
      font-size: 22rpx;
      width: 150rpx;
      height: 52rpx;
      border-radius: 26rpx;
      display: flex;
      justify-content: center;
      align-items: center;
    }
  }
}
</style>